41f8b8e807
This change enables emitting CFI unwind information for debugging purpose for targets with MCAsmInfo::ExceptionsType == ExceptionHandling::None. Currently generating CFI unwind information is entangled with supporting the exceptions, even when AsmPrinter explicitly recognizes that the unwind tables are being generated as debug information. In fact, the unwind information is not generated even if we specify --force-dwarf-frame-section, unless exceptions are enabled. The LIT test llvm/test/CodeGen/AMDGPU/debug_frame.ll demonstrates this behavior. Enable this option for AMDGPU to prepare for future patches which add complete CFI support. Reviewed By: dblaikie, MaskRay Differential Revision: https://reviews.llvm.org/D78778
138 lines
7.0 KiB
LLVM
138 lines
7.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx908 < %s | FileCheck %s
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%struct.A = type { [100 x i32] }
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; The 64-bit pointer argument %arg1 will be split into two registers
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; and for its llvm.dbg.declare, DAG should emit two DBG_VALUE instructions
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; with the fragment expressions.
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define hidden void @ptr_arg_split_subregs(%struct.A* %arg1) #0 !dbg !9 {
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; CHECK-LABEL: ptr_arg_split_subregs:
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; CHECK: .Lfunc_begin0:
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; CHECK: .loc 1 5 0 ; example.cpp:5:0
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; CHECK-NEXT: .cfi_sections .debug_frame
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: ; %bb.0:
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; CHECK-NEXT: ;DEBUG_VALUE: ptr_arg_split_subregs:a <- [DW_OP_LLVM_fragment 32 32] [$vgpr1+0]
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: v_mov_b32_e32 v2, 1
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: ;DEBUG_VALUE: ptr_arg_split_subregs:a <- [DW_OP_LLVM_fragment 0 32] [$vgpr0+0]
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; CHECK-NEXT: .loc 1 7 13 prologue_end ; example.cpp:7:13
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; CHECK-NEXT: flat_store_dword v[0:1], v2 offset:396
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; CHECK-NEXT: .loc 1 8 5 ; example.cpp:8:5
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; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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; CHECK-NEXT: .Ltmp1:
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; CHECK: .cfi_endproc
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call void @llvm.dbg.declare(metadata %struct.A* %arg1, metadata !20, metadata !DIExpression()), !dbg !21
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%gep1 = getelementptr inbounds %struct.A, %struct.A* %arg1, i32 0, i32 0, i32 99, !dbg !22
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store i32 1, i32* %gep1, align 4, !dbg !23
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ret void, !dbg !24
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}
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; FIXME: The 64-bit pointer argument %arg2 will be split between a register and
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; the stack memory. The SelectionDAG though failed to emit the DBG_VALUE for the
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; split part in memory. The two DBG_VALUE instructions emitted in the output pattern
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; are totally misleading. The former represent part of the incoming argument in register
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; while the latter was emitted for the parameter copy to a virtual register inserted
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; at the function entry by DAGBuilder.
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define hidden void @ptr_arg_split_reg_mem(<31 x i32>, %struct.A* %arg2) #0 !dbg !25 {
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; CHECK-LABEL: ptr_arg_split_reg_mem:
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; CHECK: .Lfunc_begin1:
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; CHECK-NEXT: .loc 1 10 0 ; example.cpp:10:0
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: ; %bb.0:
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; CHECK-NEXT: ;DEBUG_VALUE: ptr_arg_split_reg_mem:b <- [$vgpr31+0]
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; CHECK-NEXT: ;DEBUG_VALUE: ptr_arg_split_reg_mem:b <- [$vgpr31+0]
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: buffer_load_dword v32, off, s[0:3], s32
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; CHECK-NEXT: v_mov_b32_e32 v0, 1
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; CHECK-NEXT: .Ltmp2:
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; CHECK-NEXT: .loc 1 12 13 prologue_end ; example.cpp:12:13
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; CHECK-NEXT: s_waitcnt vmcnt(0)
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; CHECK-NEXT: flat_store_dword v[31:32], v0 offset:396
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; CHECK-NEXT: .loc 1 13 5 ; example.cpp:13:5
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; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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; CHECK-NEXT: .Ltmp3:
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; CHECK: .cfi_endproc
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call void @llvm.dbg.declare(metadata %struct.A* %arg2, metadata !26, metadata !DIExpression()), !dbg !27
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%gep2 = getelementptr inbounds %struct.A, %struct.A* %arg2, i32 0, i32 0, i32 99, !dbg !28
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store i32 1, i32* %gep2, align 4, !dbg !29
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ret void, !dbg !30
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}
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; FIXME: The 64-bit pointer argument %arg3 will be entirely in the stack memory.
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; No DBG_VALUE emitted for the incoming argument in this case and it should be fixed.
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define hidden void @ptr_arg_in_memory(<32 x i32>, %struct.A* %arg3) #0 !dbg !31 {
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; CHECK-LABEL: ptr_arg_in_memory:
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; CHECK: .Lfunc_begin2:
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; CHECK-NEXT: .loc 1 15 0 ; example.cpp:15:0
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: buffer_load_dword v1, off, s[0:3], s32 offset:4
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; CHECK-NEXT: buffer_load_dword v0, off, s[0:3], s32
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; CHECK-NEXT: v_mov_b32_e32 v2, 1
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; CHECK-NEXT: .Ltmp4:
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; CHECK-NEXT: .loc 1 17 13 prologue_end ; example.cpp:17:13
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; CHECK-NEXT: s_waitcnt vmcnt(0)
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; CHECK-NEXT: flat_store_dword v[0:1], v2 offset:396
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; CHECK-NEXT: .loc 1 18 5 ; example.cpp:18:5
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; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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; CHECK-NEXT: .Ltmp5:
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; CHECK: .cfi_endproc
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call void @llvm.dbg.declare(metadata %struct.A* %arg3, metadata !32, metadata !DIExpression()), !dbg !33
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%gep3 = getelementptr inbounds %struct.A, %struct.A* %arg3, i32 0, i32 0, i32 99, !dbg !34
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store i32 1, i32* %gep3, align 4, !dbg !35
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ret void, !dbg !36
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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attributes #0 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6, !7}
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!llvm.ident = !{!8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 13.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "example.cpp", directory: "temp")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{i32 7, !"uwtable", i32 1}
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!7 = !{i32 7, !"frame-pointer", i32 2}
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!8 = !{!"clang version 13.0.0"}
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!9 = distinct !DISubprogram(name: "ptr_arg_split_subregs", scope: !10, file: !10, line: 5, type: !11, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!10 = !DIFile(filename: "example.cpp", directory: "temp")
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!11 = !DISubroutineType(types: !12)
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!12 = !{!13}
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!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !10, line: 1, size: 3200, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS1A")
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!14 = !{!15}
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !13, file: !10, line: 2, baseType: !16, size: 3200)
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!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 3200, elements: !18)
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!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!18 = !{!19}
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!19 = !DISubrange(count: 100)
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!20 = !DILocalVariable(name: "a", scope: !9, file: !10, line: 6, type: !13)
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!21 = !DILocation(line: 6, column: 7, scope: !9)
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!22 = !DILocation(line: 7, column: 7, scope: !9)
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!23 = !DILocation(line: 7, column: 13, scope: !9)
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!24 = !DILocation(line: 8, column: 5, scope: !9)
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!25 = distinct !DISubprogram(name: "ptr_arg_split_reg_mem", scope: !10, file: !10, line: 10, type: !11, scopeLine: 10, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!26 = !DILocalVariable(name: "b", scope: !25, file: !10, line: 11, type: !13)
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!27 = !DILocation(line: 11, column: 7, scope: !25)
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!28 = !DILocation(line: 12, column: 7, scope: !25)
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!29 = !DILocation(line: 12, column: 13, scope: !25)
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!30 = !DILocation(line: 13, column: 5, scope: !25)
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!31 = distinct !DISubprogram(name: "ptr_arg_in_memory", scope: !10, file: !10, line: 15, type: !11, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!32 = !DILocalVariable(name: "c", scope: !31, file: !10, line: 16, type: !13)
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!33 = !DILocation(line: 16, column: 7, scope: !31)
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!34 = !DILocation(line: 17, column: 7, scope: !31)
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!35 = !DILocation(line: 17, column: 13, scope: !31)
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!36 = !DILocation(line: 18, column: 5, scope: !31)
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